Alpha Olefin Sulfonate (AOS) is an anionic surfactant used in cleansers, shampoos, and body washes to produce foam and remove dirt and oil. It is valued for good lathering and stability across a range of water hardness and pH levels.
| Reported effect | How often | Notes |
|---|---|---|
| Skin irritation/dryness | Common | As an anionic surfactant it can strip natural lipids, especially with frequent use or high concentrations. |
| Eye irritation | Common | Can cause stinging or redness on direct ocular contact, relevant for shampoos and washes. |
| Contact dermatitis | Uncommon | Irritant rather than allergic in most cases; more likely in sensitive or compromised skin. |
| Allergic sensitization | Rare | True allergic reactions are infrequently reported. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.
Peer-reviewed papers on this ingredient, via PubMed.